A method for receiving a signal by using M multiple beams in a multi-antenna system including N antenna elements, is provided in and embodiment of the present application. The method includes setting, by M beams, a beam direction for the M beams and a modulation frequency for frequency modulation of a beam response and generating the M beams according to the beam direction and the modulation frequency set by the beams. M beam responses are generated for a receiving signal by using the generated M beams and the generated M beam responses are frequency modulated by using the modulation frequency set by the beams. The frequency-modulated M beam responses are band-pass filtered so as to separate the M beam responses and the separated M beam responses are respectively demodulated.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for receiving a signal by using an M number of beams in a multi-antenna system including an N number of antenna elements, the method comprising: determining, by a beam controller, beam directions and modulation frequencies for frequency-modulating beam responses to generate the M number of beams; generating, by a beamformer, the M number of beams according to the beam directions and the modulation frequencies; generating, by a receiver, an M number of beam responses to a signal received by the M number of generated beams; frequency-modulating, by a processor, the generated M number of beam responses using the modulation frequencies that are set according to the M number of beams; band-pass filtering an, by the processor, M number of frequency-modulated beam responses and separating the M number of beam responses from each other; and demodulating, by a demodulator, each of the separated M number of beam responses.
2. The method as claimed in claim 1 , further comprising: determining, by the beam controller, pairs of beam directions and modulation frequencies that cause a sum of values obtained by multiplying the M number of beams, wherein the pairs of beam directions and modulation frequencies are set for a k-th antenna element, by the modulation frequencies, and set according to the M number of beams, to become one of complex gain values capable of being expressed by a transmit/receive module (TRM) connected to the k-th antenna element; and selecting, by the beam controller, the beam directions and the modulation frequencies that are set according to the M number of beams, from among the determined pairs of the beam directions and the modulation frequencies.
3. The method as claimed in claim 2 , further comprising storing the determined pairs of the beam directions and the modulation frequencies in a table form.
4. The method as claimed in claim 2 , further comprising: converting, by the beam controller, a sum of values, set according to the M number of beams, obtained by multiplying the M number of beams by the modulation frequencies into a complex number having a magnitude and a phase; and determining, by the beam controller, the pairs of beam directions and the modulation frequencies that cause the converted phase to become a multiple of a phase value capable of being expressed by a phase shifter within the TRM and cause the converted magnitude to become a multiple of a magnitude value capable of being expressed by an attenuator within the TRM.
5. The method as claimed in claim 4 , wherein the phase value capable of being expressed by the phase shifter corresponds to 2π×(½)Np, wherein Np represents a number of bits of the phase shifter.
6. The method as claimed in claim 4 , wherein the phase value capable of being expressed by the attenuator corresponds to 2π×(½)Na, wherein Na represents a number of bits of the phase shifter.
7. The method as claimed in claim 1 , wherein a sum of values, set according to the M number of beams, obtained by multiplying the M number of beams by the modulation frequencies, corresponding to a value changing according to time.
8. An apparatus for receiving a signal by using an M number of beams in a multi-antenna system including an N number of antenna elements, the apparatus comprising: a beam controller configured to determine beam directions and modulation frequencies for frequency-modulating beam responses to generate the M number of beams; a beamformer configured to generate the M number of beams according to the beam directions and the modulation frequencies; a receiver configured to generate an M number of beam responses to a signal received by the M number of generated beams; a digital signal processor configured to: frequency modulate the generated M number of beam responses using the modulation frequencies that are set according to the M number of beams; and band-pass filter an M number of frequency-modulated beam responses and separates the M number of beam responses from each other; and a demodulator configured to demodulate each of the separated M number of separated beam responses.
9. The apparatus as claimed in claim 8 , wherein the beam controller is further configured to: determine pairs of beam directions and modulation frequencies that cause a sum of values obtained by multiplying the M number of beams, wherein the pairs of beam direction and modulation frequencies are set for a k-th antenna element, by the modulation frequencies, and set according to the M number of beams, to become one of complex gain values capable of being expressed by a transmit/receive module (TRM) connected to the k-th antenna element; and select the beam directions and the modulation frequencies that are set according to the M number of beams, from among the determined pairs of the beam directions and the modulation frequencies.
10. The apparatus as claimed in claim 9 , wherein the beam controller is further configured to: convert a sum of values, set according to the M number of beams, obtained by multiplying the M number of beams by the modulation frequencies into a complex number having a magnitude and a phase; and determine pairs of the beam directions and the modulation frequencies that cause the converted phase to become a multiple of a phase value capable of being expressed by a phase shifter within the TRM and cause the converted magnitude to become a multiple of a magnitude value capable of being expressed by an attenuator within the TRM.
11. The apparatus as claimed in claim 10 , wherein the phase value capable of being expressed by the phase shifter corresponds to 2π×(½)Np, wherein Np represents a number of bits of the phase shifter.
12. The apparatus as claimed in claim 10 , wherein the phase value capable of being expressed by the attenuator corresponds to 2π×(½)Na, wherein Na represents a number of bits of the phase shifter.
13. The apparatus as claimed in claim 10 , further comprising a storage that stores the determined pairs of the beam directions and the modulation frequencies in a table form.
14. The apparatus as claimed in claim 8 , wherein a sum of values, set according to the M number of beams, obtained by multiplying the M number of beams by the modulation frequencies, corresponding to a value changing according to time.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 6, 2014
August 20, 2019
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